Pipe-cutter



(No Model.)

J; 5J. GRIFFIN PIPE GUTTER.

No. 565,267. Patented Aug. 4, 1896.

W @./CZ M UNITED STATES ATENT GFFICE.

JAMES J. GRIFFIN, OF THORNDIKE, MASSACHUSETTS.

PIPE-CUTTER.

SPECIFICATION forming part of Letters Patent No. 565,26*?, dated August4, 1896.

Application led May 29, 1896. Serial No. 593,548. (No model.)

To all whom t may concern:

Be it known that 1, JAMES J. GRIFFIN, a citizen of the United States ofAmerica, residing at Thorndike, in the county of Hampden and State ofMassachusetts, have invented new and useful Improvements inPipe-Cutters, of which the following is a specification.

This invention relates to pipe-cutters such as are in general use forcutting metal pipes by steam-tters and others, which consist of one ormore rotary cutters in a fixed jaw and one or more rotary cutters in anadjustable jaw, the latter being operated by a screw adjustment.

The object of this invention is to provide means for removing from theends of pipes cut by this form of cutter the4 bur or lip which remainson the end of said pipe in the form of an annular protuberanceprojecting above the exterior surface thereof, and which now has to beremoved by hand before a dieplate can be applied to said pipe forthreading the same.

The invention consists of the construction of a pipe-cutter, all ashereinafter described and claimed in the following specification andillustrated in the drawings, in which- Figure 1 is a perspective view ofa pipecutter embodying this invention. Fig. 2 is a longitudinal sectionof the same; and Fig. 3 shows a piece of pipe having a groove madetherein by the rotary cutters and showing the cutting-tool for removingthe bur from said pipe in a section taken on line 3 3, Fig. 2.

Referring to the drawings, A represents the frame of the pipe-cutterhaving the usual curved lower jaw B, within the end of which is pivotedthe rotary cutter 2. An adjustable yoke 3 is pivotally secured to theframe A at 4, and a rotary cutter 5 is pivoted in said yoke at 6. Anadjusting or feed screw 7 passes through a hub 8, threaded to receivesaid screw. The lower end of the said screw bears against the upper sideof the yoke 3, as shown. At a point substantially equidistant from thecenters of the said two rotary cutters is secured in said frame thebur-cutting tool 9 for rotary movement on its pin 10. Said curved jawBis provided with a troughshaped groove O, within which said cutter 2and said bur-cutting tool are located. Said cutting-tool 9 is supportedon its pin between two washers 12 and 13 of somewhat smaller diameterthan said cutter. The said washers are as much smaller in diameter thanthe cutting-tool as the :thickness of the chip of metal removed fromsaid pipe by said tool, and it is only after the bur has been cut offfrom the ends of the pipe that the latter rests on the said washers.

In the drawings the difference in the diameters of the cutting-tool andits washers is somewhat exaggerated.

A portion of the periphery of said cutter is cut away, as at ct and b,which leaves a segment-shaped part of said periphery 14, whichconstitutes the vbur-cutting portion thereof, said cuts at a. and bbeing of such shape as will give the proper pitch to the cutting edge ofsaid segment and permit the easy access to said cutting edge for thepurpose of grinding the same and to afford sufficient clearance for thechips removed by the said tool.

In the periphery of the cutting-tool 9 a segment-shaped cut 15 is made,the sides of which cut serve as stops to the rotation of the tool ineither direction by the engagement of said sides with the tapered end ofa screw 16. By entering said screw 16 more or less into said segmentalcut the degree of its rotation in either direction is restricted. Thepurpose of this adjustment is to permit the presentation of the cuttingedges of said part 14 of the cutting-tool at a proper angle to theexterior surface of the pipe to be operated upon, as said cutting edgesare ground oft from time to time as they become dulled by use. On saidsegmental part 14 of the cutting-tool and between the cutting edgesthereof are a series of grooves parallel with said cutting edges.

The arrow across the part of the handle of the frame or stock A in Fig.2, near the jaw B thereof, indicates the direction of the movement whichis given to said stock in cutting oft pipe. If said pipe-cutter stock isnow turned in the opposite direction, the bur-cutting tool 9 will berotated on Yits pin by the engagement'of the grooved periphery of thesegment 14 with the surface of the pipe, and the opposite corner of thesaid segment is brought into operative position against the surface ofthe pipe.

It will be observed that in whichever direc- IOO tion the pipe-cutter isrevolved the cutting edge of the segment Will always be in approximatelythe same position relative to the other tWo bearing-points for saidpipe-viz., the tivo rotary cutters 2 and -and said cutting edges can beground with reference to operating on said pipe at such a point betweensaid two cutters and at such an angle to the circumference of the pipeas to citer the least resistance to the operation of said pipe-cutter.

Having thus described my invention, What I claim, and desire to secureby Letters Patent, is-

l. In a pipe-cutter, a frame or head having one rotary cutter in a fixedpart thereof and another adjustably supported thereon, a rotatablebur-cutting tool secured in said fixed part of said frame, said cutterhaving two cutting edges, and a surface between said edges concentricwith the pin on which said cutter rotates, a segment-shaped eut in saidcutter and a tapered screw engaging with the sides of said cut, forrestricting the degreeof rotation of said cutter, substantially asdescribed.

2. In a pipe-cutter, a head, one or more rotary pipe-cutters hung onsaid head combined with a revoluble bur-cutting tool having asegment-shaped bed of cutting-teeth on its periphery extending inopposite directions, and means for permitting a reciprocally-rotatingmovement of said tool, whereby the teeth at either extremity of said bedare brought to position for cutting action upon the bur of a piece ofpipe, substantially as set forth.

3. A pipe-eutter head,one or more rotatable pipe-cutters hung thereon,combined with a revoluble bur-cutting tool having a recess 15, in itsperiphery, and a segment-shaped bed on its periphery opposite saidrecess having cutting-teeth thereon extending in opposite directions,and a fixed stop-pin 16, in said head, one end of which enters saidrecess7 whereby the revoluble movement of said tool in oppositedirections is limited, and either end of said tooth-bearing bed isbrought into operative position against a bur on a piece of pipe,substantially as set forth.

JAMES J. GRIFFIN.

Witnesses:

II. A. CHAPIN, K. I. CLEMoNs.

